Harold Co. reported the following current year purchases and sales data for its only product.

Date

Activities

Units Acquired at Cost

 

Units Sold at Retail

Jan. 1

Beginning inventory

100 units @ $10 =

$ 1,000

 

Jan. 10

Sales

 

 

90 units @ $40

Mar. 14

Purchase

250 units @ $15 =

3,750

 

Mar. 15

Sales.

 

 

140 units @ $40

July 30

Purchase

400 units @ $20 =

8,000

 

Oct. 5

Sales

 

 

300 units @ $40

Oct. 26

Purchase 

600 units @ $25 =

15,000

 

 

Totals

 

1,350 units

 

$27,750

 

530 units

 

Harold uses a perpetual inventory system. Determine the costs assigned to ending inventory and to cost of goods sold using (a) FIFO and (b) LIFO. Compute the gross margin for each method.